Memotec CX900e, Hardware Reference Manual, Page: 49 / 200

4 DATA EXPANSION MODULE
3006M100-002
4-3
It can also operate asynchronously at following speeds:
• 134 bps - 128 Kbps
4.1.3 Power
The DEM re5 VDC from the 120-pin connector of the motherboard and
returns ground to it.
4.2 DTE/DCE Configuration for Seventh Port Option
The optional seventh port can be physically configured either as a DTE or a DCE
device. The factory default configuration is DCE.
DCE
When configured as a DCE device, the port transmits DCD, DSR, and CTS and
the synchronous clocks - TXC and RXC. The port must receive DTR and RTS
from the attached DTE. Terminals, printers, controllers and hosts are always DTE
devices.
DTE
When configured as a DTE device, the port transmits DTR, RTS and ETXC and
receives DCD, DSR, and CTS and the synchronous clocks (TXC and RXC) from
the attached DCE.
Two jumper banks socketed at U3 and U4 provide DTE/DCE configuration.
Permanent metal bands on the top surface of the jumper banks strap signals
according to DCE/DTE requirements. The orientation of these jumper banks
determines whether the port will be DTE or DCE. Rotating each jumper 180°
changes the port from one kind of device to the other, as illustrated below.
Figure 4-2 DEM DTE/DCE Configuration Jumpers